Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate
2009-06-02
2011-10-18
Mulpuri, Savitr (Department: 2812)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
C381S404000
Reexamination Certificate
active
08041070
ABSTRACT:
The invention relates to a small speaker. A speaker1comprises: a magnetic circuit3having a yoke7, a magnet15, and a pole piece16; a vibration system4having a voice coil18and diaphragm19which are joined to each other through a voice coil bobbin23; and a frame2which holds the magnetic circuit3and the vibration system. The voice coil is placed in a magnetic gap17. In the speaker, dampers26which are extended respectively from a plurality of places of an opening side end portion of the voice coil bobbin are disposed, and tip end portions of said dampers are bonded and fixed to the frame. The voice coil bobbin is supported from the lower side. The resistance to input is improved without impairing the thinness of the speaker1, and while suppressing the increase of the production cost.
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Kamimura Tomohiko
Yuasa Hideo
Bacon & Thomas PLLC
Hosiden Corporation
Mulpuri Savitr
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